swordfish gluten free

how to cook perfect swordfish not well done. cook it as I show with a little pink and it won\'t be dry. It is the opposite of Chilean sea bass that can take over cooking and still be acceptable.
1&1/2 thick piece, 1/4 c. shallots, 1/4 c. yam flour, regular flour if you want gluten, 1 T. ea. butter and olive oil, salt and pepper, 2 T. capers, 3 garlic cloves, 5 small button mushrooms, 1 tsp. lemon juice.